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Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)

Robert Raszuk <robert@raszuk.net> Sat, 22 October 2016 13:53 UTC

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References: <01f301d228b4$e3319ef0$a994dcd0$@ndzh.com> <20161017215134.GA464@pfrc.org> <20161018190851.GC15392@shrubbery.net> <20161018191521.GT95811@Vurt.local> <9EFC9BAA-F917-4C70-A139-1F69CAECF9C0@pfrc.org> <20161020215938.GE1074@Vurt.local> <adb00bcd7b8e45db857eae7019c646fc@XCH-ALN-014.cisco.com> <ae5da282-201c-f745-9f26-67ce73826bd5@i3d.net> <CA+b+ERkV2PBtzzx=uoygDzvTyJzunROCNX=0Y4phvGdn=oK5Xw@mail.gmail.com> <20161022122735.GC79185@Space.Net>
From: Robert Raszuk <robert@raszuk.net>
Date: Sat, 22 Oct 2016 15:53:05 +0200
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To: Gert Doering <gert@space.net>
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Cc: heasley <heas@shrubbery.net>, IETF IDR WG <idr@ietf.org>, Susan Hares <shares@ndzh.com>
Subject: Re: [Idr] WG LC on draft-ietf-idr-large-community-03.txt (10/17/2016 to 10/31/2016)
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You are mixing SRC_ASN with TARGET_ASN in the same field.

Yes RFC1997 works like that but here we have opportunity to improve it.

Thx
R.

On Oct 22, 2016 2:27 PM, "Gert Doering" <gert@space.net> wrote:

> Hi,
>
> On Fri, Oct 21, 2016 at 05:42:37PM +0200, Robert Raszuk wrote:
> > > Secondly, there's literally no way for the vendor to check whether an
> > > ASN belongs to "the entity that defines the meaning of the rest of the
> > > Large Community"
> >
> > Why not ?
> >
> > If you do not make those 4 octets configurable by spec and always fill it
> > with AS number defined in your BGP instance you will have assurance it
> > is ASN of the entity that defines the rest 8 octets of the LC as
> otherwise
> > you will likely not establish any EBGP sessions to your peers.
>
> But that is only half the intended usage of communities - one is
> "I tag it with <myas>:<some meaning>" to signal something to my own
> routers or my customers.
>
> The other one is "I tag it with <jobs as>:<some meaning>", and there is
> no way for my router to validate that "<jobs as>" is indeed the one
> who defined "<some meaning>".
>
> So, how exactly is the vendor to check variant B?
>
> (And if you do not understand what people use communities for, today,
> maybe you should not be argueing these points, sorry)
>
> > So there is very easy way to enforce it today in any BGP implementation.
>
> No.
>
> Gert Doering
>         -- NetMaster
> --
> have you enabled IPv6 on something today...?
>
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